Merge branch 'devel' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace into tracing/urgent

This commit is contained in:
Ingo Molnar 2008-11-11 21:34:07 +01:00
commit c1e7abbc7a
3 changed files with 106 additions and 6 deletions

View File

@ -120,6 +120,9 @@ unsigned long ring_buffer_overruns(struct ring_buffer *buffer);
u64 ring_buffer_time_stamp(int cpu);
void ring_buffer_normalize_time_stamp(int cpu, u64 *ts);
void tracing_on(void);
void tracing_off(void);
enum ring_buffer_flags {
RB_FL_OVERWRITE = 1 << 0,
};

View File

@ -185,7 +185,6 @@ enum {
};
static int ftrace_filtered;
static int tracing_on;
static LIST_HEAD(ftrace_new_addrs);
@ -506,13 +505,10 @@ static int __ftrace_modify_code(void *data)
{
int *command = data;
if (*command & FTRACE_ENABLE_CALLS) {
if (*command & FTRACE_ENABLE_CALLS)
ftrace_replace_code(1);
tracing_on = 1;
} else if (*command & FTRACE_DISABLE_CALLS) {
else if (*command & FTRACE_DISABLE_CALLS)
ftrace_replace_code(0);
tracing_on = 0;
}
if (*command & FTRACE_UPDATE_TRACE_FUNC)
ftrace_update_ftrace_func(ftrace_trace_function);

View File

@ -16,6 +16,35 @@
#include <linux/list.h>
#include <linux/fs.h>
#include "trace.h"
/* Global flag to disable all recording to ring buffers */
static int ring_buffers_off __read_mostly;
/**
* tracing_on - enable all tracing buffers
*
* This function enables all tracing buffers that may have been
* disabled with tracing_off.
*/
void tracing_on(void)
{
ring_buffers_off = 0;
}
/**
* tracing_off - turn off all tracing buffers
*
* This function stops all tracing buffers from recording data.
* It does not disable any overhead the tracers themselves may
* be causing. This function simply causes all recording to
* the ring buffers to fail.
*/
void tracing_off(void)
{
ring_buffers_off = 1;
}
/* Up this if you want to test the TIME_EXTENTS and normalization */
#define DEBUG_SHIFT 0
@ -1133,6 +1162,9 @@ ring_buffer_lock_reserve(struct ring_buffer *buffer,
struct ring_buffer_event *event;
int cpu, resched;
if (ring_buffers_off)
return NULL;
if (atomic_read(&buffer->record_disabled))
return NULL;
@ -1249,6 +1281,9 @@ int ring_buffer_write(struct ring_buffer *buffer,
int ret = -EBUSY;
int cpu, resched;
if (ring_buffers_off)
return -EBUSY;
if (atomic_read(&buffer->record_disabled))
return -EBUSY;
@ -2070,3 +2105,69 @@ int ring_buffer_swap_cpu(struct ring_buffer *buffer_a,
return 0;
}
static ssize_t
rb_simple_read(struct file *filp, char __user *ubuf,
size_t cnt, loff_t *ppos)
{
int *p = filp->private_data;
char buf[64];
int r;
/* !ring_buffers_off == tracing_on */
r = sprintf(buf, "%d\n", !*p);
return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
}
static ssize_t
rb_simple_write(struct file *filp, const char __user *ubuf,
size_t cnt, loff_t *ppos)
{
int *p = filp->private_data;
char buf[64];
long val;
int ret;
if (cnt >= sizeof(buf))
return -EINVAL;
if (copy_from_user(&buf, ubuf, cnt))
return -EFAULT;
buf[cnt] = 0;
ret = strict_strtoul(buf, 10, &val);
if (ret < 0)
return ret;
/* !ring_buffers_off == tracing_on */
*p = !val;
(*ppos)++;
return cnt;
}
static struct file_operations rb_simple_fops = {
.open = tracing_open_generic,
.read = rb_simple_read,
.write = rb_simple_write,
};
static __init int rb_init_debugfs(void)
{
struct dentry *d_tracer;
struct dentry *entry;
d_tracer = tracing_init_dentry();
entry = debugfs_create_file("tracing_on", 0644, d_tracer,
&ring_buffers_off, &rb_simple_fops);
if (!entry)
pr_warning("Could not create debugfs 'tracing_on' entry\n");
return 0;
}
fs_initcall(rb_init_debugfs);